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  • Title: Postoperative nitrous oxide analgesia. Administration from air entrainment oxygen masks with a primary flow of Entonox.
    Author: Goddard JM.
    Journal: Anaesthesia; 1986 Sep; 41(9):915-8. PubMed ID: 3777395.
    Abstract:
    Nitrous oxide is occasionally used as an analgesic agent in the postoperative period. The feasibility of administering a known concentration from an air entrainment oxygen mask, using a primary flow of Entonox, (50% oxygen/50% nitrous oxide) was investigated. Accurox (C.R. Bard Canada Inc.) blenders, disconnected from their facemasks, were studied using a primary flow of Entonox. An increase in air entrainment of approximately 13% was demonstrated. Concentrations of about 20% nitrous oxide in oxygen enriched air, appropriate for postoperative analgesia, can be produced, but the methods are extravagant in the use of Entonox and are likely to be slightly unreliable.
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